描述
数控机床变频器用CNC输出0-10V控制转数,电压周期性波动造成主轴转数不稳,信号线屏蔽层接地答:这个可以肯定的是电磁干扰引起的原因为主的故障。
首先断开这个负载,确定这个模拟量输出是否稳定,正常。信号线不但要接地,而且变频器与控制器都需要接地,同时接地需要规范。
你用单端接地方式试一下,即将信号屏蔽线的金属外层连接在控制器的接地端子上,在变频器模拟量输入的端子上,不做信号接地连接。
同时变更一下导线连接的位置。类似的问题我曾经碰到过一次,有一西门子840d系统因24V电源模块烧毁(3相输入型),一时没有相应的电源模块,我临时用单相替代(用1个380/220V的隔离变压器),结果该系统时不时的出现急停故障报警,当时想不明白是什么原因,仔细思考了一下,会不会是因此处的隔离变频器的临时线与控制柜的急停按钮控制线过近引起,将那个临时线(扎带去掉)分开,哎,这个故障就没有再出现。这个例子也告诉我走线也很重要的。后来,等那个电源模块到货后,把它恢复原样了。
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主营:世界知名品牌的PLC、DCS系统备件模块
①Allen-Bradley(美国AB)系列产品》
②Schneider(施耐德电气)系列产品》
③General electric(通用电气)系列产品》
④Westinghouse(美国西屋)系列产品》
⑤SIEMENS(西门子系列产品)》
⑥销售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
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顺序控制、梯形逻辑控制、事故追忆处理、数模转换、输入/输出信号处理、数
据通信及处理等。Invensys Triconex:冗余容错控制系统、基于三重模件冗余(TMR)
结构的zui现代化的容错控制器。
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◆Motorola(摩托罗拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
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